Index: dtrace/timestamps.d
===================================================================
diff -u -rb14118b7068e3c1e903b9a516eef0c86101b24d9 -rcbd6b858b9324c125b8b6aad66c85d3482bb8bd4
--- dtrace/timestamps.d	(.../timestamps.d)	(revision b14118b7068e3c1e903b9a516eef0c86101b24d9)
+++ dtrace/timestamps.d	(.../timestamps.d)	(revision cbd6b858b9324c125b8b6aad66c85d3482bb8bd4)
@@ -1,11 +1,30 @@
-nsf*:::method-entry
-{
+/* 
+ * Measure time btween method-entry and method-returns
+ *
+ * Display execution flow between 
+ *    ::nsf::configure dtrace on
+ * and
+ *    ::nsf::configure dtrace off
+ *
+ */
+
+nsf*:::configure-probe /!self->tracing && copyinstr(arg0) == "dtrace" / {		       
+  self->tracing = (arg1 && copyinstr(arg1) == "on") ? 1 : 0;
+}
+
+nsf*:::configure-probe /self->tracing && copyinstr(arg0) == "dtrace" / {
+  self->tracing = (arg1 && copyinstr(arg1) == "off") ? 0 : 1;
+}
+
+nsf*:::method-entry /self->tracing/ {
   self->start = timestamp;
 }
 
-nsf*:::method-return
-/self->start/
-{
+nsf*:::method-return /self->tracing && self->start/ {
   @[copyinstr(arg0), copyinstr(arg1), copyinstr(arg2)] = avg(timestamp - self->start);
   self->start = 0;
-}
\ No newline at end of file
+}
+
+END {
+  printa("\n%-35s %-35s %-40s = %@d", @);
+}